Discrete spectral lines are observed when excitation occurs in a
A) solid.
B) liquid.
C) gas.
D) superconductor.
E) all of the above
Answer: C
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When a voltage is generated by rotating a coil in a magnetic field at a constant rate, the period of the voltage equals the time that it takes for the coil to rotate through ________ radians
a. 1 b. ?/2 c. ? d. 2?
A 360-nm thick oil film floats on the surface of a pool of water water. The indices of refraction of the oil and the water are 1.5 and 1.33, respectively
When the surface of the oil is illuminated from above at normal incidence with white light, what are the two wavelengths of light between 400 nm to 800 nm wavelength that are most strongly reflected? A) 430 nm and 720 nm B) 450 nm and 740 nm C) 490 nm and 780 nm D) 410 nm and 700 nm E) 470 nm and 760 nm
Two infinite, uniformly charged, flat surfaces are mutually perpendicular. One of the sheets has a charge density of +60 pC/m2, and the other carries a charge density of -80 pC/m2 . What is the magnitude of the electric field at any point not on either surface?
a. 1.1 N/C b. 5.6 N/C c. 7.9 N/C d. 3.8 N/C e. 4.0 N/C
Due to absorption of shorter wavelengths by interstellar dust clouds, distant stars appear:
A) bluer. B) brighter. C) redder. D) larger. E) to have a higher radial velocity.